Senior Java Backend Engineer
Offer summary

(Summary generated by AI based on the full job description)

The project involves building and maintaining AI-enabled backend services in Java 17+ using REST/SOAP, Docker, Kubernetes. Key responsibilities include designing scalable cloud-native microservices, managing security with Keycloak, and monitoring via Dynatrace. The role covers establishing consistent engineering standards, API integration, and diagnosing and optimizing systems in regulated environments.

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Senior Java Backend Engineer

Company: Webellian Sp. z o.o.

from: 5 June 2026
to: 5 July 2026
salary not specifiedB2B contract (full-time)
salary not specifiedcontract of employment
Offer parameters
level:senior
working mode:hybrid
Warszawa, Mokotów
Warszawa, MokotówDomaniewska 45View on map

Requirements

Expected technologies

Java
REST
SOAP
JSON
YAML
XML
Git
GitHub
Docker
SQL
DB2
PostgreSQL
CoPilot
Claude Code
Maven
Kubernetes
AWS
Jenkins
GitHub Actions
Nexus
Keycloak
Dynatrace
A3K Framework
Airwave
CISL API
Jira
Confluence

Our requirements

  • Proficiency in Java 17+ and backend technologies such as REST, SOAP, JSON, YAML, XML.
  • Familiarity with Git/GitHub, Docker, SQL (DB2, PostgreSQL), CoPilot/Claude Code, Maven, Kubernetes/AWS, Jenkins/GitHub Actions/Nexus.
  • Knowledge of Keycloak, Dynatrace, A3K Framework, Airwave, CISL API, Jira/Confluence.
  • An agile mindset with experience in Agile methodologies and English proficiency at B2 level.
  • Basic knowledge of AI technologies, principles, and their practical use.

Optional

  • German language skills are an advantage.

Your responsibilities

  • Design, build, and maintain Java-based backend services and REST/SOAP APIs powering AI-enabled solutions: clean interfaces, robust domain models, and maintainable data access patterns.
  • Deliver cloud-native microservices using Docker and Kubernetes, with attention to scalability, resilience, and cost.
  • Integrate and standardize API exposure via gateway patterns, including authentication/authorization, versioning, and usage policies.
  • Establish and maintain observability standards using Dynatrace and other monitoring tools (dashboards, alerting, distributed tracing, and runbooks).
  • Diagnose and resolve complex issues across microservices, clusters, and pipelines; perform root-cause analysis and preventative improvements.
  • Embed security and resilience: secrets management, Keycloak-based authentication, least privilege, container security best practices, and disaster recovery patterns.
  • Engineer for regulated environments: implement audit-friendly practices such as traceable changes, reliable logging, and disciplined handling of sensitive data.
  • Collaborate with ML Engineers, Platform Engineers, AI Architects, and DevOps to deliver shared foundations and consistent standards across global teams.
  • Champion Claude Code as an active daily tool for development, debugging, code review, and documentation tasks.

About the project

As a Senior Java Backend Engineer within Advanced Analytics Team, you will join the central AI team to build and maintain robust, production-grade AI-enabled services on a global scale. You will work in a cross-functional environment with ML Engineers, Platform Engineers, AI Architects, and DevOps, taking end-to-end ownership from design through reliable operations. In this role, you will help establish consistent engineering standards for security, observability, and delivery, and contribute to scalable internal platforms and shared services that accelerate teams worldwide.

This is how we organize our work

This is how we work

agilescrum

This is how we work on a project

  • issue tracking tools
  • testing environments
Join a growing team of dedicated professionals! We love to pass on the knowledge to grow excellence, speak our minds without playing politics, and just enjoy hanging around together. If you share our passions - we want to meet you! So go ahead and apply ➡️
Company

What we offer

  • Contract under Polish law: B2B or Umowa o Pracę.
  • Benefits such as private medical care, group insurance, Multisport card.
  • English classes available.
  • Hybrid work (at least 1 day/week on-site) in Warsaw (Mokotów).
  • Opportunity to work with excellent professionals.
  • High standards of work and focus on the quality of code.
  • New technologies in use.
  • Continuously learning and growth.
  • International team.
  • Pinball, PlayStation & much more (on-site).

Benefits

  • sharing the costs of sports activities
  • private medical care
  • life insurance
  • remote work opportunities
  • fruits
  • video games at work
  • coffee / tea
  • drinks
  • parking space for employees
  • leisure zone
  • Pinball, PlayStation & much more
  • English classes

Recruitment stages

  • 1.
    📞A quick phone call with our Recruiter.
  • 2.
    📅Online technical interview, testing your skills.
  • 3.
    📅II face-to-face interview with your potential supervisor.
  • 4.
    🗒️Feedback.

Webellian Sp. z o.o.

Webellian is a well-established Digital Transformation and IT consulting company committed to creating a positive impact for our clients. We strive to make a meaningful difference in diverse sectors such as insurance, banking, healthcare, retail, and manufacturing. Our passion for cutting-edge and disruptive technologies, as well as our shared values and strong principles, are what motivate us. We are a community of engineers and senior advisors who work with our clients across industries, playing a deep and meaningful role in accelerating and realizing their vision and strategy.

This is how we work

Senior Java Backend Engineer
I apply to:
Webellian Sp. z o.o.
Warszawa, Mokotów
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